diff --git a/tests/federation/test_complexity.py b/tests/federation/test_complexity.py
index 0c9987be54..5cd0510f0d 100644
--- a/tests/federation/test_complexity.py
+++ b/tests/federation/test_complexity.py
@@ -99,6 +99,37 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
self.assertEqual(f.value.code, 400, f.value)
self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)
+ def test_join_too_large_admin(self):
+ # Check whether an admin can join if option "admins_can_join" is undefined,
+ # this option defaults to false, so the join should fail.
+
+ u1 = self.register_user("u1", "pass", admin=True)
+
+ handler = self.hs.get_room_member_handler()
+ fed_transport = self.hs.get_federation_transport_client()
+
+ # Mock out some things, because we don't want to test the whole join
+ fed_transport.client.get_json = Mock(return_value=defer.succeed({"v1": 9999}))
+ handler.federation_handler.do_invite_join = Mock(
+ return_value=defer.succeed(("", 1))
+ )
+
+ d = handler._remote_join(
+ None,
+ ["other.example.com"],
+ "roomid",
+ UserID.from_string(u1),
+ {"membership": "join"},
+ )
+
+ self.pump()
+
+ # The request failed with a SynapseError saying the resource limit was
+ # exceeded.
+ f = self.get_failure(d, SynapseError)
+ self.assertEqual(f.value.code, 400, f.value)
+ self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)
+
def test_join_too_large_once_joined(self):
u1 = self.register_user("u1", "pass")
@@ -141,3 +172,81 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
f = self.get_failure(d, SynapseError)
self.assertEqual(f.value.code, 400)
self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)
+
+
+class RoomComplexityAdminTests(unittest.FederatingHomeserverTestCase):
+ # Test the behavior of joining rooms which exceed the complexity if option
+ # limit_remote_rooms.admins_can_join is True.
+
+ servlets = [
+ admin.register_servlets,
+ room.register_servlets,
+ login.register_servlets,
+ ]
+
+ def default_config(self):
+ config = super().default_config()
+ config["limit_remote_rooms"] = {
+ "enabled": True,
+ "complexity": 0.05,
+ "admins_can_join": True,
+ }
+ return config
+
+ def test_join_too_large_no_admin(self):
+ # A user which is not an admin should not be able to join a remote room
+ # which is too complex.
+
+ u1 = self.register_user("u1", "pass")
+
+ handler = self.hs.get_room_member_handler()
+ fed_transport = self.hs.get_federation_transport_client()
+
+ # Mock out some things, because we don't want to test the whole join
+ fed_transport.client.get_json = Mock(return_value=defer.succeed({"v1": 9999}))
+ handler.federation_handler.do_invite_join = Mock(
+ return_value=defer.succeed(("", 1))
+ )
+
+ d = handler._remote_join(
+ None,
+ ["other.example.com"],
+ "roomid",
+ UserID.from_string(u1),
+ {"membership": "join"},
+ )
+
+ self.pump()
+
+ # The request failed with a SynapseError saying the resource limit was
+ # exceeded.
+ f = self.get_failure(d, SynapseError)
+ self.assertEqual(f.value.code, 400, f.value)
+ self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)
+
+ def test_join_too_large_admin(self):
+ # An admin should be able to join rooms where a complexity check fails.
+
+ u1 = self.register_user("u1", "pass", admin=True)
+
+ handler = self.hs.get_room_member_handler()
+ fed_transport = self.hs.get_federation_transport_client()
+
+ # Mock out some things, because we don't want to test the whole join
+ fed_transport.client.get_json = Mock(return_value=defer.succeed({"v1": 9999}))
+ handler.federation_handler.do_invite_join = Mock(
+ return_value=defer.succeed(("", 1))
+ )
+
+ d = handler._remote_join(
+ None,
+ ["other.example.com"],
+ "roomid",
+ UserID.from_string(u1),
+ {"membership": "join"},
+ )
+
+ self.pump()
+
+ # The request success since the user is an admin
+ self.get_success(d)
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